Common Crawl maintains a free,open repository of web crawl data that can be used by anyone.
Common Crawl is a 501(c)(3) non–profit founded in 2007. We make wholesale extraction, transformation and analysis of open web data accessible to researchers.
We probed the 100,000 most-linked web hosts for IPv6 support using the Common Crawl Web Graph. Only 36.9% are fully reachable over IPv6, with adoption ranging from 71% among the top 100 to 32% in the long tail.